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[Resolved] Random Question
Posted: Tue Jun 18, 2019 7:12 pm
by TheSAguy
Why is my code below creating a line vs. random.
I'd expect the x and y values to be random and thus the chart to be all over the place.
Code: Select all
local radius = 2.5
local x_offset = math.random(-250, 250)
local y_offset = math.random(-250, 250)
local position = {x_offset, y_offset}
local area = {{x_offset - radius, x_offset - radius}, {x_offset + radius, x_offset + radius}}
for _,force in pairs( game.forces )do
force.chart( game.surfaces[1], area)
end
Re: Random Question
Posted: Tue Jun 18, 2019 7:17 pm
by steinio
because math.random
with values smaller then 317 results in the same value:
viewtopic.php?t=19353#p123786
Re: Random Question
Posted: Tue Jun 18, 2019 7:24 pm
by eduran
Code: Select all
local area = {{x_offset - radius, x_offset - radius}, {x_offset + radius, x_offset + radius}}
You are using x_offset twice and y_offset not at all.
That is not true. It produces deterministic pseudo-random numbers.
Re: Random Question
Posted: Tue Jun 18, 2019 7:37 pm
by TheSAguy
eduran wrote: ↑Tue Jun 18, 2019 7:24 pm
Code: Select all
local area = {{x_offset - radius, x_offset - radius}, {x_offset + radius, x_offset + radius}}
You are using x_offset twice and y_offset not at all.
face-palm!
Thanks,.
Re: Random Question
Posted: Tue Jun 18, 2019 7:41 pm
by eradicator
The whole "seeds below x produce same random output" is a problem with LuaRandomGenerator, not math.random anyway. And even then only if you run *multiple generators in parrallel*. Totally not related to this.
You can't chart less than one chunk, so your very small radius will have no effect unless your position is really close to a chunk border.
Code: Select all
/c
for i=1,10 do
local r = 0.0001
local x,y = math.random(-250,250), math.random(-250,250)
local area = {{x-r,y-r},{x+r,y+r}}
game.forces.player.chart(game.surfaces.nauvis,area)
end